I'm sure you're fine with it, since you don't personally have to deal with it in any way. Men evolved to be hunters, killers, fighters, and to do these things to other men. The differences are not just physical (
https://en.wikipedia.org/wiki/Sexual_dimorphism#Humans, males have a ridiculous advantage in all the necessary physical qualities required by warriors) but psychological. Men and women differ by the presence or absence of entire complex adaptations. Just as men lack uteri and women lack testicles, so too, there are differences of psychological machinery as well. Considering the evolved roles, who do you think has the psychological machinery suited for combat?
This is disregarding all the other issues, like unit cohesion, jealousy, favoritism, sexual assault, pregnancy, the list goes on and on. A group of young males filled with testosterone behaves very differently when you add just one woman to the equation than they do with just other males. Men are built to be attracted by women, women are built to be attracted by men. This creates a lot of problems in a combat arms military setting.
Most of all, it's fucking unnecessary. As if there aren't enough young men willing to kill and die for their country.